Fred Benjamin Gernerd (November 22, 1879 – August 7, 1948) was an American lawyer and politician who served one term as a Republican member of the U.S. House of Representatives from Pennsylvania from 1921 to 1923.

He graduated from Franklin and Marshall College in Lancaster, Pennsylvania, in 1901, from Columbia University's school of political science in New York City in 1903, and from Columbia Law School in 1904.

In 1905, he returned to Allentown, serving as district attorney of Lehigh County from 1908 to 1912.

Gernerd was elected as a Republican to the Sixty-seventh Congress but was an unsuccessful candidate for reelection in 1922.

He resumed the practice of law in Allentown and served as a delegate to the 1928 Republican National Convention.